Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 163, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2021.110562
Keywords
Lithium -ion batteries; Bi-based anode; Dual-carbon supporting nanoarchitecture; High capacity; Ultralong cycling life
Funding
- Entrepreneurship training Program for College Students of Zhejiang Sci-Tech University [202010338030]
- Taishan Young Scholar Program
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A novel dual-carbon supported nanostructured architecture of bismuth/carbon nanocomposites has been fabricated for the first time, showing remarkable improvement in lithium storage performance. The as-fabricated composite exhibited superior structural stability and electrochemical kinetics, delivering unprecedented lithium storage capacity even after a large number of cycles. The results provide inspiration for the rational design of advanced lithium storage nanostructured alloying-based anodes.
Bismuth (Bi) is regarded as a prospective candidate for new lithium-ion battery anodes, but its capacity and cycle life need to be improved. Even with design and preparation of various Bi/carbon (Bi/C) nanocomposites, the performance improvement of the Bi for lithium-ion battery anode is still not unfavorable. Herein, the peculiar dual-carbon supporting nanostructured architecture has been fabricated for the first time and demonstrated to be highly effective in improving the lithium storage of the Bi anode. This as-fabricated characteristic Bi/C nanocomposite is composed of Bi nanoparticles (containing small amounts of bismuth trioxide (Bi2O3)) with sizes ranging from 10 to 50 nm encapsulated within capsule-like porous carbon matrixes, which are further interlinked with amorphous porous carbon (PC) coated carbon nanotubes (CNT). This composite is therefore denoted as CNT@Bi/Bi2O3@PC. The results demonstrate that the well-designed architecture endows the as-fabricated composite with superior structural stability and improved electrochemical kinetics. As a result, the CNT@Bi/ Bi2O3@PC displays unprecedented lithium storage performance, delivering high capacity of 513 mAh g-1 at 200 mA g-1 after 600 cycles and 232 mAh g-1 at 1000 mA g-1 after even 2500 cycles. Moreover, thus unprecedented performance of the CNT@Bi/Bi2O3@PC in association with its architecture advantages can offer inspiration for rational design of other nanostructured alloying-based anodes toward advanced lithium storage.
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